The action hook wp_login runs when the user logs in – it can run a simple function. function do_anything() { //do stuff } add_action(‘wp_login’, ‘do_anything’); documentation : https://codex.wordpress.org/Plugin_API/Action_Reference/wp_login The real breadwinner here is wp_authenticate which has a bit of documentation. It passes an array with the given username and password, which gives you the opportunity … Read more
After a bit more slogging through code and Googling, I found the answer. It’s contained in this thread (see Otto42’s post), but for the record, adding the following to your plugin will override the 404 handling for the conditions you specify: add_filter(‘template_redirect’, ‘my_404_override’ ); function my_404_override() { global $wp_query; if (<some condition is met>) { … Read more
Just use the the_content filter, e.g.: <?php function theme_slug_filter_the_content( $content ) { $custom_content=”YOUR CONTENT GOES HERE”; $custom_content .= $content; return $custom_content; } add_filter( ‘the_content’, ‘theme_slug_filter_the_content’ ); ?> Basically, you append the post content after your custom content, then return the result. Edit As Franky @bueltge points out in his comment, the process is the same … Read more
When a post is updated there are some hooks that are fired: ‘pre_post_update’ is an action fired just before the post is updated, the argument passed are 2: $post_ID and $data that is an array of all the other database colums of the post table ‘transition_post_status’ is an hook fired on update, and pass 3 … Read more
The update_post_meta hooks are called from the more generic update_metadata() function, so you might not have found it directly. The three hooks are: update_post_metadata, a filter which allows you to “hijack” the metadata update and do something else. If you hook up a function that returns a boolean, execution stops there and the boolean is … Read more
Filters and actions are both assigned to hooks. Functions assigned to hooks are stored in global $wp_filter variable. So all you have to do is to print_r it. print_r($GLOBALS[‘wp_filter’]); PS. add_action function makes a add_filter call. And the latter does $wp_filter[$tag][$priority][$idx]. NOTE: you can directly add this code in functions.php, and you will see a … Read more
Look into the global variable $wp_filter. See my plugin for a list of all comment filters for an example: <?php /* Plugin Name: List Comment Filters Description: List all comment filters on wp_footer Version: 1.1 Author: Fuxia Scholz License: GPL v2 */ add_action( ‘wp_footer’, ‘list_comment_filters’ ); function list_comment_filters() { global $wp_filter; $comment_filters = array (); … Read more
Why registering and queuing properly matters it should be in time – earlier than script/style is up for being output to page, otherwise it is too late; it should be conditional – otherwise you are loading stuff where you don’t need it and cause performance and functionality issues, for this you need WP environment loaded … Read more
the hook is the same save_post just make sure its your post type ex: add_action(‘save_post’,’save_post_callback’); function save_post_callback($post_id){ global $post; if ($post->post_type != ‘MY_CUSTOM_POST_TYPE_NAME’){ return; } //if you get here then it’s your post type so do your thing…. }
@Arlen: As Keith S points out Adam Brown’s List of Hooks is the defacto resource of hooks for WordPress. However, it’s not perfect: It doesn’t show the hooks in order of when they are called, It doesn’t provide file name or line number where invoked, It doesn’t provide a number of arguments passed, It’s not … Read more